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Related Concept Videos

Modified-Release Drug Delivery Systems: Stimuli-Activated01:30

Modified-Release Drug Delivery Systems: Stimuli-Activated

Stimuli-activated drug delivery systems are designed to release drugs in response to specific physical, chemical, or biological stimuli. These systems often utilize hydrogels—three-dimensional, hydrophilic polymer networks capable of swelling in aqueous environments and retaining significant fluid volumes. Upon exposure to particular stimuli, these hydrogels undergo structural transitions that allow the embedded drug to be released. Due to this adaptive behavior, such systems are also called...

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Toward Light-Responsive Hydrogel-Based Valves for Flow Regulation.

Annina Mittelholzer1, Vincent Hickl1,2,3, Katharina Maniura-Weber1

  • 1Laboratory for Biointerfaces, Empa, Swiss Federal Laboratories for Materials Science and Technology, Sankt Gallen 9014, Switzerland.

Langmuir : the ACS Journal of Surfaces and Colloids
|February 23, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed smart hydrogel valves using gold nanorods that respond to light for precise control in biomedical applications. These light-activated valves offer tunable, fast, and reversible switching for microfluidics and soft robotics.

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Soft Robotics

Background:

  • Smart hydrogels offer tunable responses to external stimuli, making them ideal for soft actuators.
  • Light-triggered hydrogels enable contactless stimulation and reversible morphological changes without damaging the material.
  • Demand exists for novel, tunable, miniaturizable, and fast-responding valve designs for various applications.

Purpose of the Study:

  • To fabricate and characterize stimulus-responsive valves using active hydrogels.
  • To investigate the mechanics of valve operation under different stimuli, particularly light.
  • To provide quantitative understanding of hydrogel valve deformation and control.

Main Methods:

  • Fabrication of stimulus-responsive valves using cross-linked poly(N-isopropylacrylamide) (PNIPAM) hydrogels.
  • Embedding gold nanorods (AuNRs) as photothermal transducers for light-induced deformation.
  • Utilizing near-infrared radiation for contactless, spatiotemporal control of hydrogel morphology.
  • Quantitative image analysis to correlate valve behavior with confinement, aspect ratio, and stimulus parameters.

Main Results:

  • Local, inhomogeneous deformations of the hydrogel lead to reversible valve opening and closing.
  • Valve response (opening/closing) is controllable by changing aspect ratio and confinement.
  • Light-triggered actuation allows for fast response times (seconds) and precise spatial control.
  • Valves demonstrated robustness, withstanding hydrostatic pressures up to 18 kPa.

Conclusions:

  • Light-activated hydrogel valves with embedded AuNRs provide tunable and rapid control for microfluidic and soft robotic applications.
  • Quantitative analysis offers mechanistic insights into hydrogel valve deformation, crucial for multicomponent device design.
  • These valves hold significant potential for biomedical applications requiring precise pressure modulation and rapid switching.